Maybe I've been hiding under a rock for too long, or maybe it's because I'm a keyboard player who's never had a strong desire to play Beatles covers. Either way, I had never heard of what I now realise is often described as the most mysterious chord in music - the opening chord in the Beatles' "Hard Days Night".

The first chord of this song is renowned for its difficulty to be replicated. Earlier this week though it has been claimed that a British mathematician has solved the mystery and figured out the notes actually being played at the start of the track.

Though a little further digging on YouTube indicates that he may not have been the first... check out the video below. What do you think?